Video "Jitter" when Keep Aspect Ratio selected with TMPGEnc?

Discussion in 'MPEG-1 and MPEG-2 encoding (AVI to DVD)' started by Awake77, Jun 19, 2005.

  1. Awake77

    Awake77 Member

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    Hello! This is my first post in these forums...:)

    Im trying to get an avi file converted to .m2v with TMPGEnc. The original .avi is in 16x9 letterbox format, and it seems the only way to get this translated to .mpv correctly is to have "Full Screen (Keep Aspect Ratio)" selected in the Video Arrange Method menu under the Advanced tab in the Settings dialog.

    However, when I do this, after the file is encoded (some 26 hours later will max quality settings on my AMD XP2600+) - every few seconds it seems like the video framerate drops - the animation gets 'choppy' for a second and then goes back to normal.

    I didnt notice any of this when I kept the Video Arrange Method on "Full Screen" but then the video comes out Animorphic which is unacceptable.

    Any guesses as to why this is going on?

    Thanks
    Chris
     
    Awake77, Jun 19, 2005
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  2. rebootjim

    rebootjim Active member

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    What's the framerate of the original?
    What framerate are you trying to get?
    Did you set the source aspect as 1:1 or 16:9?
     
    rebootjim, Jun 19, 2005
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  3. Awake77

    Awake77 Member

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    Thanks for the response rebootjim -

    According to GSpot, framerate of the original AVI is 23.976 FPS.

    I'm setting the framerate in TMPGEnc Plus to 23.976(Internally 29.97)

    Source aspect ratio was set to 1:1

    I did a quick encode with VSO DivXtoDVD, and it comes out fine - although I'd really like to achieve the higher quality that one can get with the right settings in TMPGEnc.

    Thanks,
    Awake77
     
    Awake77, Jun 19, 2005
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  4. rebootjim

    rebootjim Active member

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    Set 2 pass VBR encoding.
    Set DC component precision to 10.
    Source aspect 1:1 is correct.
    Set Keep aspect ratio "2".
    Set video source to Non-interlace, and try top field first. Use bottom field first if it looks better, you'll have to try both.
    You only need to encode about 5 minutes to test...
    If this is a low motion source, try CBR, if you can use a bitrate over 4000kbps.
    Also try CQ-VBR, set to about 90, and adjust bitrate to fit.
    (2 pass vbr is NOT automatically better).
     
    rebootjim, Jun 19, 2005
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  5. Snapon

    Snapon Member

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    If your encoding to SVCD it may look fuunny at 1st (everyone is sqished in) because you did a 16:9 > 1:1. !BUT! When you actually view the feature on a TV (not PC) the picture automatically gets pullled out to a 4:3 (Durring play back) So basically you encode from a 16:9 to 1:1 and it inherantly (or automatically streches to a 4:3) When you watch it from your craftmatic adjustable chair.
     
    Snapon, Jun 25, 2005
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  6. Dela

    Dela Administrator Staff Member

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    26 hours for a cbr encoding? that's not right. Also what u decribe about the animation sounds to me like the work of a rogue codec, something like what the angelpotion codec is infamous for. AngelPotion basically made the video go blocky and puink, get worse and worse for about 5 seconds, then it would go back to normal, after a few seconds it would bgin to get bad again.

    Have you installed codec opacks in the past liko nimo for example?
     
    Dela, Jun 25, 2005
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  7. rebootjim

    rebootjim Active member

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    26 hours is totally unacceptable.
    What is the framesize of the original?
    Major resizing can slow things down this much.
    Incorrect framerate conversions can give you the "dropped frames" look too.
     
    rebootjim, Jun 26, 2005
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